In today's age of digital marketing, it is becoming harder and harder to justify using services that mine contacts from various locations. Not only do these contacts that you can get from data.com not want to hear from you, most email providers do not allow you to even send to them so I'm not sure why you would want to use this for this reason. We tried using the contact mining system one time on 5,000 people and it yielded very poor results. The email hit less then half of the contacts had under an 8% open rate and not a single person clicked through on the offer for a free ebook. With that being said the only useful way to use the application is to check up on your existing contacts to make sure things like mailing address are up to date. Even with this feature though we found a lot of the data they provide is out of data and shows a ton of people who have left companies.